KBABZ wrote:
The reason why World of Warcraft is so addictive is due to it's pay-to-play service. You pay a certain amount of cash to play, so you don't want to go by wasting any time with that money you spent.
That's part of it, but most people playing, at least while they're actively playing the game, aren't thinking "I've got to get my money's worth out of this month's payment." Some do, but for the majority of players, that reasoning is merely an excuse that's more acceptable than admitting they have an addiction to a video game.
Look at free online games similar to WoW, and you'll find many players behaving very similarly. Even some console games have addictive qualities, but they're much more limited in scope so they don't have the same longevity or recurring reinforcement as the online games that update periodically.